Car and Driver discusses 3D printed car parts. A lot of experimentation and testing has been done in this area but so far not many start ups have emerged. Out of use, rare or expensive car parts present a big opportunity for 3D printing either in using the printed parts directly or casting metal parts from 3D prints. Spare parts are a big source of profits for dealers and car brands so it remains to be seen if they will join the business themselves or try to sue people that attempt to do this.